ok so i was wondering if you have a whipit cracker and you bought a shit load of co2 cartrages from walmart for those cheap paintball guns...could that possibly work if you were to crack the co2 cartrage by the plants or like inbetween two of them or something?
You'd get the same results if you stood in your grow room and did some deep breathing exerecises for several minutes a few times a day. Good ventilation is more important than co2 is.